Lifting



' 1 .QShoetn-Sheat 1.

A. J. LOGAN. Lmma .ucx.

Patents d Nov. 3, 1891.

(In Model.)

'(No ModeL) 2 Sheets-Sheet 2.

A. J. LOGAN. LIPTING JACK-L niTED STATES PATENT OFFICE.

. .l. LUGAN, ()1 tLliA RlflELl), PENNSYLVANIA.

.uFTtNo-JscK.

SPECIFICATION forming part of Letters Patent No. 462,566, dated November 3,1891.

Application filed July 20, 1891. Serial No. 400,140. (No model.)

To alt whom it may concern..-

Be it known that I, ALBERT .i. Lott-xx, a citizen of the United States, residing at Clearfield, in the county of (Jle arlield and State of Pennsylvania, have invented certain new and usefulImprovements in Lifting-Jacks; and I do hercby'declare the following tobe a full,

clear, and exact description ot' the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Myinventionrelates toa lifting or hoisting jack, and is designed for raising heavy and bulky objects, its object being to provide a comparatively simple and an effective jack; and myinvention eonsists'of certain features of novelty to be hereinafter dcscribedand then pointed out in the claims.

In the accompanying dra-wings,-Figure 1 is a perspective view ot my improved jack. Fig. 2 is a vertical section thereof. Fig. 3 is a vertical section on line Ht 111, Fig. :2. Fig. 4 is a section on line Y V, Fig. 3. Fig. 5 is a perspective view of the operating attachment.

The jack comprises three distinct parts to w a support or guide frame, an elevatorframe, and the operating attachments.

The support or guide frame consists of parallel side bars a a. supported on abase or foot a, which is braced by parallelribs I I. The lower parts of the bars (I (t are connected by a web I), and above the web they are connected by a cross-piece c, which provided with a longitudinal recess c in its top. This recess is semicircular in cross-section and affords an open bearing for a device to be hereinafter described. From the inm-rtalgt-s of the side bars a a, above the cross-piece 0, parallel flanges d d project, and these llange's for-m between them longitudinal recesses or gu deways d d in the sidebars. Projections or steps a" extend upwardly from the upper ends of side bars a d. s.

e 1: indicate the sides ol the clcvator1'rame. from the lower ends of which projects a li ting-toot r, strengthened by ribs 1.

f is the top of the clevatt r-t'rame, consisting ot' a plate connecting the sides. Both the lifting-foot 5 and the top 1 are preferably.

roughened'or serrated on the upper-surfaces, as shown.

to allow the movement ol" the heads.

At the inner edges of each of the sides e c of the elewttor-lrame is a pair of parallel rackbars 5 the teeth g of the rack-bars of the respective sides being presented toward each other and extending downwardly.

.-\n oscillating rest It works between the side bars (I o in the recesses (1' d of the gnidedrame, its lower end it being rounded or beaded and having bearing in the recess (1 of the t. 'oss-piece I and constituting a hinge connection. The upper end i of the oscillating rest It is provided with a rounded or beaded portion .lleceivcd between. the upper ends of the side bars n is a block which at its lowerside has a transverse recess It, semicircular in cross-section to receive the rounded or beaded portion o1 oscillating rest 7L and constituting a hinge connection for the block. The recess is flared at to allow the block to rock. At the sides of the block 7;- are trnnnions I, which guide the block into position between the side bars (t a and have bearing in the recesses d. (7 against the opposing sides of the tlangcs d d. Projecting rearwardly from the block Ir is a handle socket m [or the reception of a handle m. In the top of the block 1. is a pair of trans verse seats 22 11, providing bearings for the rounded or beaded portions o o of the oscillating'arms o a. The arms are thus hinged to the block 1;, and are confined to their seats by means of alockdiarp, which passes through longitudinal slots W in the arms and is sccured ateaeh end tothe block .\t the upper end of each arm o n is a movable head (1, provided with a longitudinal opening 1 1hrll;l t of with h is Wa d c nf rmed to receive and provide a bearing for the rounded or beaded portion 1 of the arm. Passing through the respective armso 1/ and their heads are pins r, which conlinc the heads to the arms. the arms having short openings r From each side of the heads t] projects a lateral extension s. each provided with a series of upwardl v-projeeling teeth s ontheiroutersides or at the fronts oi the heads. are arranged on each side of the projections or stops 0, being kept in that position by the latter. A disengaging-lever 25 is pivoted at its inner end in the slot p of the rear arm The heads q.

tor-frame is now placed over the support or guide-frame and the operating attachments, said elevator-frame having an open back if to allow the handle-socket m and the lever i to project through. \Vhen the elevator-frame is down, it is locked to the guide-frame by means of a spring-catch pin in, which projects through an openingin the lower end of the elevator-f-rame and into a bolt/hole m at the lower end of the guide-frantic, Above the hole to is a bolt-hole :11 into which the catch n1 springs when the elevator-frame has been raised to its highest limit. At each side of the elevator-frame is a swinging bail y, by

which the jack may be lifted for carrying it about. Above the bails are shoulders ,2, for limiting-the upward movement. thereof.

The jack is operated as follows: The elevator-frame is raised by reciprocating ithe handle of the rocking block}, thusalternately raising and lowering the toothed heads (1 and causing their teeth to alternately en'gage'the rack-bars at the front and back, respectively, of the elevator frame. In this way great ower is obtained, and while one of the toothed heads is being lowered to take a fresh hold the other one supports the elev torl'rame= The weight of the lever fissutligient to hold the toothed heads (1 up agains the rack-bars. When it desired to lower the elevator-frame, the lever 25 raised, thus causing the toggle connection between the arms 0 1/ todraw the teeth of the heads (1 away from the rack-oars.

Slight changes will readily suggest thenr selves to skilled mechanics and can be made without departing from the scope and spirit of my invention.

Having thus described my invention, what I claim as new therein, and desire to secure by Letters Patent, isr 1. Ina lifting-jack, the combination, with a supporter guide-frame and an elevator-frame, of means for operating the latter, consisting of an oscillating rest supported in the guideframo, arocking block hinged to said rest and provided with suitabledleviees for working the elevator-frame, and means for rocking said block, substantially as set forth.

purpose set forth.

2. In a lifting-jack, the combination, with a support or guide-frameprovided with parallel side bars and the toothed,operating attachments mounted between the side bars, of an elevator-framehaving paired rack-bars engaged by the teeth and between which the side bars are received, substantially as set forth. I W

ii. In a lifting-jack, the combination, with a support or guide-frame and an elevator-frame, of means for operating the latter, consisting of a rocking block supported in the guide-frame, a pair of arms hinged near together-at their lower ends and provided with devices for raising the elevatorframe, means for drawing the arms together to lower the elevator-frame, and

means for rocking said block, substantially as setforth.

i. In a liftii'igjaek, the Combination, with a support or guide-traine and an elevator-frame provided with rack-bars; of means for, operating the latter, consisting ofa rocking block "supported in the guide-frame, a pair of arms hinged to the block at their lower ends, movable toothed heads at theupper ends of the arms, the teeth of which are adapted to en- 7 gage the rack-bars, and means for roekin g said block, substal'itially as set. forth.

5. In a lifting-jack, the combination, with a support orguide-framcand an elevator-frame, oi"; means foroperating the latter, consisting of a pair of alternately-movable arms provided with devices for raising the elevator-frame, a

toggle connection between the arms, and

means for working the toggle connection to draw the arms together, whereby the elevatorframe is lowered, substantially as and for the 6. In a lifting} oh, the combination, with a support or guide-frame and an elevator-frame, of means for operating the latter, consisting of a pair of alternately-inovable arms provided with devices for raising the elevator-frame, a lever pivoted to one of said arms and provided I, with a lateral extension, and a toggle-link pivoted to the latter and to the other arm, substantially as set forth.

7. In a lifting-jack, the combination, with a support or guide-frame provided with an upper and a lower bolt-hole and an elevatorframe, ot a spring-bolt secured to the elevatorframe and adapted to automatically engage oitherot said holes, sullstttnl ially as set forth.

ln testimony whereof I al'lix my signature'in presence 0t two witnesses.

ALBERT J. LOGAN.

Witnesses-z WM. C. ilnmniohn 

